Exhaust air valve



FIG. 1 is a perspective view of an exhaust air valve in an open position, showing my new design;

FIG. 2 is a perspective view thereof, in a closed position;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a side elevational view thereof; and

FIG. 5 is a top plan view thereof. 

The ornamental design for an exhaust air valve, substantially as shown and described. 